Research On Hotspot Stress Monitoring And Fatigue Damage Of Quayside Container Crane

The quayside container cranes(referred to as the shore bridge),as a port specialized transport container equipment,work in intensive tasks and complex environmental conditions for long-term.In order to work for the reliability and safety,the need for appropriate structural monitoring of the shore bridge is necessary.Shore bridge equipment is huge,and has thousands of welds.In the special equipment testing industry,there is no clear statement for where the specific parts of the stress should be monitored,which result in the mess of the selection for the various points of the various methods currently,so finding accurate and effective structural stress state monitoring method is imminent.Under the background,this paper carries out the research of fuzzy identification method of high risk fractured seam area based on the fuzzy level comprehensive evaluation theory,and discusses the stress monitoring and fatigue damage prediction method of the hot-spot.Specific researches are as follows:(1)This paper introduces the single-level evaluation and multilevel evaluation for fuzzy comprehensive evaluation method and the classification of membership function.Secondly,it elaborates the basic steps of hierarchical analysis and the determination of weight of complex system hierarchy,and the fuzzy identification method of fractured seam is provided.The paper introduces the two most widely used sensors in the current stress monitoring technology,and demonstrates their advantages and disadvantages.(2)Researching on fuzzy recognition method of high risk fracture weld area;based on the design,manufacture and service process,the factors influencing the weld cracking are studied comprehensively,and the influencing factors system is established on the basis of the analytic hierarchy process theory.Then,according to the corresponding standard rules,the evaluation rules of the membership degree of each factor are set,and four experts are invited to score the investigation among the factors,and determine the final weight of each factor,and establish the model of fuzzy identification of high risk fractured seam area according to the corresponding theoretical basis.(3)Taking the 65t-65 m shore bridge of Qingdao port as the experimental object,thefuzzy identification method of high risk fractured seam area was used to calculate the blurred risk area of the outbound bridge structure from the angle of accident and finite element.The relevant parameters of these weld zones are substituted into the fuzzy recognition model and the hot-spots of the quayside are determined.(4)Using the application of fiber grating sensors in the identified hot spot area to carry out stress state monitoring research,and the use of mature fatigue damage prediction theory to monitor the real-time stress data analysis.And getting the results of the damage prediction of the quayside bridge.